Vertical compound balanced duplex pumping-eng



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r E. E. CLARK; VERTICAL GOMPOUND BALANCED DUPLEXPUMPING ENGINE. N0.,358,5 91. I Patented Mar. 1, 188.7.

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1 (No Model.) 3 SheetsSheet 2.

E. E. CLARK.

VERTICAL COMPOUND BALANCED DUPLEX PUMPING ENGINE.

No. 358,591. Patented Mar. 1; 188.7-

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EZRA E. CLARK, OF NORTHAMPTON, MASSACHUSETTS.

VERTICAL COMPOUND BALANCED DUPLEX PUMPING-ENGINE.

SPECIFICATION forming part of Letters Patent No. 358,591, dated March 1, 1887.

Application filed August '10, 1886. Serial No. 210,529. (No model.)

To all whom, it may concern.-

Be it known that I, EZRA E. CLARK, of Northampton, in the county of Hampshire and State of Massachusetts, have invented an Improvement in Vertical Compound Balanced Duplex PumpingEngines, of which the following is a specification.

Pumping-engines have heretofore been made in which the steam is allowed to expand into asecond cylinder, and thereby form what is known as a compound engine, and in other instances the pump has been duplex, so that the valve of one engine is moved by a connection to the piston-rod of the other eugine.

In my present improvements connect the pistons of the respective steam-cylinders to the plungers of the pumps, so that the action is direct, and I make use of steam-cylinders of different sizes, so as to expand the steam from the smaller cylinder into the larger, and .I place these cylinders and piston-rods vertically and connect them in pairs, so that the weights-of the plungers, pistons, and connections are balanced, and two pairs of engines are arranged adjacent to each other, so that the valve of one engine is moved by a connection to the other engine, and I construct the parts in such a manner that they are very compact and simple, and the moving parts are arranged so as to balance each other in their weight and lessen the resistance to the steam-engine.

In the drawings, Figure 1 is a vertical section through the pumpingcylinders and steamcylinders of one engine. Fig. 2is an elevation, partly in section, at right angles to Fig. 1. The bearings for some of the shafts are omitted in both Figs. 1 and 2,for greater clearness. Fig. 3 is a sectional plan at the line at w, and Fig. 4isasectional plan below the liner y.

The pumping-cylinders A A B B are pro vided with the hollow plunger (6 a b I) and the inlet and discharge valves, and the suction and delivery pipes are of ordinary character, and will vary according to the circumstances of use, and hence do not require further description.

Upon the respective plungers are columns or rods 0, connecting the plungers to the respective cross-heads D D D D and these cross-heads receive the lower ends of the piston-rods E E E E, that pass up through the stuffing boxes or glands of the respective steam-cylinders to the respective pistons.

The engines are arranged in pairs, the

pumps A A being driven by the enginecylinders G G, and the pumps B B by the en gine-cylinders H H, and as these pairs of engines and pumps are similarly made it is only necessary to describe in detail one pair and the connections.

Between the pumping cylinders and the steam-cylinders there are suitable columns, K, and the intermediate frame, L, that supports the bearings of the equalizing-levers and the valve-gear.

M is a walkingbeam supported in suitable bearings upon the frame L, and at the ends there are connecting-rods N O, that extend down into the hollow plungers a a, and they are jointed to said plungers by the pins 2 2. The piston of the cylinder G being larger and heavier than the piston of the cylinder G, the plunger a of the pump A is to be weighted at A sufficiently to counterpoise the parts, not only of the engines, but of the connections to the valves, as hereinafter described.

The walkiugbeam M and connecting-rods N 0 act in connection Wit-h the engine-pistons H H and plungers b b of the second engine, and pump in the same manner as before depump.

1? P represent the steam-supply pipes to the valve-chest Q Q of the engine-cylinders Gand H, and R represents the valve to the cylinder H, the valve to the cylinder G being similar.

4 and 5 represent the valve-rods to the re spective valves. These valves may be of any suitable character; but I prefer and use pistonvalves, which act to admit steam through the respective ports to the high-pressure cylinder, (G or H.)

Upon reference toFig. 3, it will be seen that the respective steam-cylinders occupy quadrilateral positions, and that the steam-valves R are between the cylinders H and G, and that the low-pressure valve-chests S and S are be tween the respective cylinders G and G and tral between the respective cylinders, and is scribed in connection with the first engine and H and H, and that the exhaust-pipe T is cenconnected laterally to the low-pressure valvechest S S.

The valve between each pair of steam-cylinders is similar to that shown in Fig. 1. I will, however, describe the same with reference to the cylinders G G.

I prefer to make use of piston-valves in the low-pressure valve-chests, and the valve U is provided with a rod, 6.

The ports 7 and 8 are at the upper and lower portions of the transfer-valve chest and connect directly the cylinders G G, and the intermediate ports, 9 and 10, are the exhaust-ports.

Upon reference to Fig. 1, it will be understood that when the piston-valve U is drawn down the port 7 is opened, so that high-pressure exhaust-steam rushes directly into the cylinder G, and that when the valve U is raised the port 8 is open for a similar object. In consequence of the respective piston and cross-heads being connected by the walkingbeam M, the piston on the rod E will be at the top of the cylinder G when the piston on the rod E is at the bottom of the cylinder G, and the reverse; hence the pistons will always be moving in opposite directions, and the high-pressure exhaust-steam from G will act directly against the piston in the cylinder G when nearest to the head, and as the steam passes out of the cylinder G it goes into and expands within the larger cylinder, G.

In Fig. 1 the parts are represented as at rest, the cylinder G being full of high-pressure steam beneath the piston, so that as soon as the low-pressure valve is raised by the movement of the other pair of engines, H H, the steam will rush through the port 8 and lift the piston in the cylinder G, and as the valve U is raised the port 9 is opened for the exhaust to pass out from the upper part of the cylinder G. Similar movements 'take place when the strokes are in the other directions.

I Upon reference to Fig. 4 the respective con-' the engine H H are connected to arms B B that extend in opposite directions from the rock-shaft 20, and this shaft 20 has an arm, 21, and a connecting rod, 22, to the walkingbeam M of the engine G G. The rock-shafts 15 and 20 are supported in suitable bearings on the frame L. By these arrangements it will be understood that when the engine G G is in motion the engine H H is quiescent, but the engine G G is moving the valves of the engine H H, and said valves admit steam to the engine H H before the engine G G completes its stroke; hence the engine H H starts the steam is equalized in the respective engines, the parts work vertically, and are balanced; hence there is very little friction or wear. The valves also are balanced both in relation to the weight of the parts and thepressure of the steam.

If the low-pressure steam-cylinders are dispensed with, the steam may be passed from the cylinders H H to the atmosphere, or to a condenser, the walking beams and double pumps remaining the same, and being balanced.

The vapors in the cylinders G H are confined between the heads and the pistons after the pistons pass over and cover the exhaustports; hence the pistons are cushioned, and by the connections to the high-pressure cylinders the pistons of the cylinders H and G are simultaneously stopped, so that there is no coucussion against the cylinder-heads.

I claim as my invention 1. The combination, with four vertical pumps, of two pairs of vertical compound engines, direct connections between the pumpplungers and the engine piston-rods, valves to the respective compound engines, and connections for moving the valve of one engine by the piston of the other engine, substantially as set forth.

2. The two vertical compound engines, each having a high-pressure and an expansion cylinder, in combination with thevertical pistonvalves and their valve-chests, the valve-rods, and connections for moving the valves of one enginelby the piston of the other engine, substantially as set forth.

3. Two vertical pumps and plungers, in combination with a pair of engine-cylinders, valves, pistons, and rods, walking-beams, and connections at the respective ends to the plungers, whereby the weights of the respective parts are balanced, substantially as set forth.

4. Two pairs of vertical pumps and plungers or pistons, in combination with two compound vertical engines, the piston-rods of which are connected to the 'pnmp-plungers, connecting-rods and walking-beams to balance the respective engines and pumps, and valves to the separate compound engines and connections from the valves of one engine to the walking-beam of the other engine, substantially as set forth.

Signed by me this 6th day of August, 1886.

EZRA E. CLARK. Witnesses:

GEO. T. PINcKNEY, WILLIAM G. Morr. 

